John,

I shoot both the 286 and 320s in my Tikka 9,3 set. The only problem I have found is that the Valmet system barrels with the full top barrel rib set up tends to make radical changes to the lower barrel during regulation for elevation, while the stiffer upper barrel doesn't move nearly as much.It becomes a problem with the higher impacting 320s.

The solution is to install a high front sight blade and file it in once everything gets as cose as you can get it otherwise.You pretty much need to get the top barrel shooting right, then move the wedge to get the bottom barrel close, both being a bit low with the high front blade installed. Then file the front sight to regulate elevation for both. Trust me; it is the easiest way to regulate for the 320s that I have come up with, and they do shoot higher than the 286s in my two o/u's.

The other solution is to get rid of the crummy Valmet sights and install a good adjustable rear sight and front blade. The problem there is scope mounting, however.

Enjoy the Tikka! I like mine better than many of my "pedigree dogs". They can't be beat for accuracy in a DR!! And...there are all those neat barrel combinations.

Regards,
L2S